meaning still black screen?
INSTALLATION INSTRUCTIONS
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You MUST follow these installation to make the theme work.
Theme will show BLACK SCREEN if these set up steps are not completed.
Theme requires:
"Winterboard"
"file:// for MobileSafari" module from Cydia(free)
"LockScreen Clock Hide" -- or any other plugin/module that hides the default clock.
1) Download and install "file:// for MobileSafari" from Cydia.
This will enable you to access the configuration screen.
2) Open Safari and type in this:
file:///Library/Themes/SlantedLock.theme/config.html
BOOKMARK this link so you can return to this page on Safari anytime to make configuration changes!
3) Enable SlantedLock in Winterboard. Now enjoy!
NOTE: It may take a few seconds to initialize on first time.
This set up is a tad confusing. However, you only need to do it once to benefit using the configuration with ease in the future.
http://forums.macrumors.com/showthread.php?t=1006066
after that, go to Photo apps and select the picture u want and set it as lock screen
it takes awhile for theme to work.